what elements are designated by each symbol or group of symbols? a) CU and Cu, b) Os and OS, c) Ni and NI, d) BIN, BiN, and BIn

Answer:

Four

Explanation:

Glycolysis ⟶    2ATP

TCA cycle ⟶    2ATP

ETC            ⟶ 34ATP

           Total = 38ATP

DNP disrupts the electron transport chain, so the bacteria will produce only four molecules of ATP from one of glucose.

Answer:

volume = 2128L

Explanation:

volume at stp = 22.4dm³ =22400L

CO2 = 12 + 2(16) = 44

4.20/44 = volume/22400L

0.095 = volume/22400L

volume = 0.095 x 22400

volume = 2128L

Answer:

The Coulomb Barrier U is 25.91 MeV

Explanation:

Given that:

Atomic Mass of lead nucleus A = 208

atomic mass of an alpha particle A = 4

Radius of an alpha particle [tex]R_\alpha = R_o A^{^{\dfrac{1}{3}}[/tex]

where;

[tex]R_\alpha = 1.2 \times 10 ^{-15} \ m[/tex]

[tex]R_\alpha = R_o A^{^{\dfrac{1}{3}}[/tex]

[tex]R_\alpha = 1.2 \times 10 ^{-15} \ m \times (4) ^{^{\dfrac{1}{3}}[/tex]

[tex]R_\alpha = 1.905 \times 10^{-15} \ m[/tex]

Radius of the Gold nucleus

[tex]R_{Au}= R_o A^{^{\dfrac{1}{3}}[/tex]

[tex]R_{Au}= 1.2 \times 10 ^{-15} \ m \times (208) ^{^{\dfrac{1}{3}}[/tex]

[tex]R_{Au} = 7.11 \times 10^{-15} \ m[/tex]

[tex]R = R_\alpha + R_{Au}[/tex]

[tex]R = 1.905 \times 10^{-15} \ m + 7.11 \times 10^{-15} \ m[/tex]

[tex]R = 9.105 \times 10 ^{-15} \ m[/tex]

The electric potential energy of the Coulomb barrier [tex]U = \dfrac{Ke \ q_{\alpha} q_{Au}}{R}[/tex]

[tex]U = \dfrac{8.99 \times 10^9 \ N.m \ ^2/C ^2 \ \times 2 ( 82) \times \(1.60 \times 10^{-19} C \ \ e } {9.105 \times 10^{-15} \ m }[/tex]

U = 25908577.7eV

U = 25.908577 × 10⁶ eV

U =  25.91 MeV

The Coulomb Barrier U is 25.91 MeV

Answer:

Choice A. Ammonium chloride.

Explanation:

Consider the bonds in each of the four compounds.

Ammonium chloride [tex]\rm NH_4Cl[/tex] is an ionic compound. Each

The [tex]\rm {NH_4}^{+}[/tex] and [tex]\rm Cl^{-}[/tex] ions in [tex]\rm NH_4Cl[/tex] are connected with ionic bonds.

What make [tex]\rm NH_4Cl[/tex] special is that its cation [tex]\rm {NH_4}^{+}[/tex] is polyatomic. In other words, each [tex]\rm {NH_4}^{+}[/tex] ion contains more than one atoms. These atoms (one [tex]\rm N[/tex] atom and four [tex]\rm H[/tex] atoms) are connected with covalent bonds. Therefore, [tex]\rm NH_4Cl[/tex] has both ionic and covalent bonds.

Carbon dioxide [tex]\rm CO_2[/tex] is a covalent compound. Each [tex]\rm CO_2[/tex] molecule contains two [tex]\rm C=O[/tex] double bonds in total. [tex]\rm CO_2[/tex] molecules have no ionic bond.

The name "ethyl ethanoate" might sound like the name of a salt (think about sodium ethanoate.) However, in reality, ethyl ethanoate [tex]\rm CH_3COOCH_2CH3[/tex] is an ester. The "ethyl" here refers to the [tex]\rm -OCH_2CH3[/tex] part, originating from ethanol. On the other hand, "ethanoate" refers to the [tex]\rm CH_3C(O)-[/tex] part, which can be obtained from ethanoic acid.

These two parts are connected with a covalent [tex]\rm C-O[/tex] single bond. (The [tex]\rm C[/tex] in ethanoic acid is connected to the [tex]\rm O[/tex] in ethanol.) As a result, there's no ionic bond in ethyl ethanoate, either.

Sodium chloride [tex]\rm NaCl[/tex] is an ionic compound. Both the [tex]\rm Na^{+}[/tex] ion and the [tex]\rm Cl^{-}[/tex] are monoatomic. While the [tex]\rm Na^{+}[/tex] and [tex]\rm Cl^{-}[/tex] in sodium chloride are connected with ionic bonds, neither [tex]\rm Na^{+}[/tex] nor [tex]\rm Cl^{-}[/tex] contains covalent bond.

Answer:

The correct answer is 7.57 grams of magnesium phosphate.

Explanation:

Based on the given question, the chemical reaction taking place is:  

2Na₃PO₄ (aq) + 3MgCl₂ (aq) ⇒ Mg₃(PO₄)2 (s) + 6NaCl (aq)

From the given reaction, it is evident that two moles of sodium phosphate reacts with three moles of magnesium chloride to produce one mole of magnesium phosphate.  

Based on the given information, 8.23 grams of magnesium chloride reacts completely with sodium phosphate, therefore, magnesium chloride in the given case is the limiting reagent.  

In the given case, 3 moles of magnesium chloride produce 1 mole of magnesium phosphate. Therefore, 1 mole of magnesium chloride will produce 1/3 mole of magnesium phosphate.  

The molecular mass of magnesium chloride is 95.21 grams per mole. So, 1 mole of magnesium chloride is equivalent to 95.21 grams of magnesium chloride.  

On the other hand, the molecular mass of magnesium phosphate is 262.85 grams per mole. Therefore, 1 mole of magnesium phosphate is equal to 262.85 grams of magnesium phosphate.  

As seen earlier that 1 mole of magnesium chloride = 1/3 moles of magnesium phosphate. So,  

95.21 grams of magnesium chloride = 1/3 × 262.85 grams of magnesium phosphate

= 262.85 / 3 grams of magnesium phosphate

1 gram of magnesium chloride = 262.85 / 3 × 95.21 grams of magnesium phosphate

8.23 grams of magnesium chloride = 262.85 / 3 × 95.21 × 8.23 grams of magnesium phosphate

= 7.57 grams of magnesium phosphate

Hence, when 8.23 grams of magnesium chloride when reacts completely with sodium phosphate, it produces 7.57 grams of magnesium phosphate.  

Answer: 28.02 g

Explanation:

The M stands for molarity. It is moles of solute/liters of solution. We can use the molarity to convert liters to mL, then make a proportion to find the grams.

[tex]\frac{2.75 mol}{L} *\frac{1L}{1000mL} =\frac{2.75 mol}{1000mL}[/tex]

Now that we have molarity in moles and mL, we can use the 107mL to get moles.

[tex]\frac{2.75moles}{1000mL} *107mL=0.29425mol[/tex]

We would multiply moles by molar mass to get grams. The molar mass of magnesium chloride is 95.211 g/mol.

[tex]0.29425mol*\frac{95.211g}{mol} =28.02g[/tex]

Answer:

7 chlorine atoms

Explanation:

K=2.8.8.1

Cl=2.8.7

pottasium will give chlorine its I valence electron to form ions as follows

K=(2.8.8)+

Cl=(2.8.8)-

It will react with 1 chlorine atom.

An ionic bond is shaped by using the whole transfer of some electrons from one atom to every other. The atom losing one or more electrons becomes a cation—an undoubtedly charged ion. The atom gaining one or more electrons will become an anion—a negatively charged ion.

In those compounds carbon, nitrogen, oxygen, and chlorine atoms have four, three, and one bonds, respectively. The hydrogen atom and the halogen atoms form the most effective covalent bond to different atoms in maximum stable neutral compounds.

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Answer:

Energy

Explanation:

Paper is oxidized in the presence of oxygen. This reaction however proceeds very slowly until energy is supplied to the system. This implies that the reaction is not spontaneous at room temperature. A spontaneous reaction takes place without any need for external supply of energy.

The need for supply of external energy must be as a result of the high activation energy required for the reaction to go to completion. If a chemical reaction has a high activation energy, it will require an external supply of energy in order for such reaction to occur.

Answer:

yes!you are right a cloudy formation will be formed when they will react.its because if nitrogen.

Answer: H2O and OH^-  are added to balance the oxygen atoms.

Explanation:

Answer:

1.563 moles of SO3.

Explanation:

We begin by calculating the number of mole present in 100g of sulphur dioxide, SO2. This can be obtained as follow:

Molar mass of SO2 = 32 + (16x2) = 64g/mol

Mass of SO2 = 100g

Mole of SO2 =..?

Mole = mass/Molar mass

Mole of SO2 = 100/64

Mole of SO2 = 1.563 mole

Now, we can obtain the number of mole of sulphur trioxide, SO3 produce from the reaction as follow:

2SO2 + O2 —> 2SO3

From the balanced equation above,

2 moles of SO2 reacted to produce 2 moles of SO3.

Therefore, 1.563 moles of SO2 will also react to produce 1.563 moles of SO3.

Therefore, 1.563 moles of SO3 is obtained from the reaction.

Answer:

Renewable Resources: are considered unlimited, are replaced faster than used.

Nonrenewable Resources: are used more quickly than replaced, have fixed amounts, cannot be replaced in a short time.

Explanation:

Renewable resources are natural resources that are able to naturally regenerate themselves, hence, they are considered to be unlimited. They are usually replaced faster than they are used because they have a short regeneration time. A good example is the solar energy.

Nonrenewable resources are those natural resources that cannot naturally regenerate and when they do, it takes a very long time (usually millions of years). They are therefore used at a much faster rate than they are being replaced and their natural deposits are more or less fixed due to the long regeneration time. A good example is the crude oil deposit.

Hence:

Renewable Resources: are considered unlimited, are replaced faster than used.

Nonrenewable Resources: are used more quickly than replaced, have fixed amounts, cannot be replaced in a short time.

Answer: !

Explanation:

Answer:

a. Acid B

b. Acid B

c. lower

Hope this helps you

Answer:

The compound formula will be "NF₃". The further explanation is given below.

Explanation:

So that the above would be the right answer.

Answer:

E. HCl

Explanation:

Cl atom does not have enough electronegativity to make enough positive charge on H.

HCl is the compound which doesn't have hydrogen bonds. This is because of

the higher size of the chlorine atom.

There is no hydrogen bond because of the high size of the chlorine.

Chlorine have electrons with a very low density. It is also very

electronegative which explains why the formation of hydrogen bonds in the

compound HCl is not possible.

Instead, HCl has covalent bonds in which electron is shared between the

hydrogen and  chlorine to achieve a stable configuration.

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Answer:

[tex]V_{CO_2}=16.0mL[/tex]

Explanation:

Hello,

In this case, given that the same temperature and pressure is given for all the gases, we can notice that 16.0 mL are related with two moles of carbon monoxide by means of the Avogadro's law which allows us to understand the volume-moles relationship as a directly proportional relationship. In such a way, since in the chemical reaction:

[tex]2CO(g)+O_2(g)\rightarrow 2CO_2(g)[/tex]

We notice two moles of carbon monoxide yield two moles of carbon dioxide, therefore we have the relationship:

[tex]n_{CO}V_{CO}=n_{CO_2}V_{CO_2}[/tex]

Thus, solving for the yielded volume of carbon dioxide we obtain:

[tex]V_{CO_2}=\frac{n_{CO}V_{CO}}{n_{CO_2}} =\frac{2mol*16.0mL}{2mol}\\ \\V_{CO_2}=16.0mL[/tex]

Best regards.

Answer:

160g

Explanation:

Mass in grams is equal to product of moles and molar mass of compound.

Explanation:

Before proceeding, we have to first understand the relationship between temperature and entropy.

From the equation of entropy which is given as;

ΔS = ΔQ / T

We can tell that entropy is inversely proportional to temperature.

This means that at constant heat, as the temperature increases, the entropy decreases and vice versa.

Inn this question, the temperature is much lower - a decrease. The effect that this would have on the value of the entropy is that it would be increased. A higher value of entropy would be recorded than the actual value of the entropy.

Answer:

The correct answer is (d) 24.8 Torr

Explanation:

When a solute is added to a solvent, the water pressure of the solution is lower than the vapor pressure of the pure solvent. This is called vapor pressure lowering and it is given by the following expression:

Psolution= Xsolvent x Pºsolvent

We have to calculate Xsolvent (mole fraction of solvent) which is given by the number of moles of solute divided into the total number of moles.

First, we calculate the number of moles of solute and solvent. The solute is glucose (C₆H₁₂O₆), and its number of moles is calculated from the mass and the molecular weight (MM):

MM (C₆H₁₂O₆)= (12 g/mol x 6) + (1 g/mol x 12) + (16 g/mol x 6) = 180 g/mol

moles of glucose= mass/MM= (72.9 g)/)(180 g/mol)= 0.405 moles

The solvent is water (H₂O) and again we calculate the number of moles as follows:

MM(H₂O)= (1 g/mol x 2) + 16 g/mol = 18 g/mol

moles of water= mass/MM= (115 g)/(18 g/mol)= 6.389 moles

Now, we calculate the total number of moles (nt):

nt= moles of glucose + moles of water= 0.405 moles + 6.389 moles= 6.794 moles

The mole fraction of water (Xsolvent) is given by:

Xsolvent= moles of water/nt= 6.389 moles/6.794 moles= 0.940

Finally, the vapor pressure of water over the solution will be the following:

Psolvent= Xsolvent x Pºsolvent= 0.940 x 26.4 Torr= 24.8 Torr

Answer:

[tex]m_{CaCl_2}=39.96gCaCl_2[/tex]

Explanation:

Hello,

In this case, for the undergoing reaction, we can compute the grams of the formed calcium chloride by noticing the 1:1 molar ratio between calcium and it (stoichiometric coefficients) and using their molar mass of 40 g/mol and 111 g/mol by using the following stoichiometric process:

[tex]m_{CaCl_2}=14.4gCa*\frac{1molCa}{40gCa} *\frac{1molCaCl_2}{1molCa} *\frac{111gCaCl_2}{1molCaCl_2}\\ \\m_{CaCl_2}=39.96gCaCl_2[/tex]

Clearly, chlorine is not used since it is said there is enough for the reaction to go to completion.

Best regards.

Answer:

54

Explanation:

The mass number of the atom is 54

Answer: 8368 Joules

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

[tex]Q=m\times c\times \Delta T[/tex]

Q = Heat absorbed or released =?

c = specific heat capacity of water = [tex]4.184J/g^0C[/tex]

Initial temperature of water = [tex]T_i[/tex] = [tex]20^0C[/tex]

Final temperature of water = [tex]T_f[/tex]  = [tex]60^0C[/tex]

Change in temperature ,[tex]\Delta T=T_f-T_i=(60-20)^0C=40^0C[/tex]

Putting in the values, we get:

[tex]Q=50.0g\times 4.184J/g^0C\times 40^0C=8368J[/tex]

Thus energy in Joules required is 8368.

Answer: The concentration of [tex]CaSO_4[/tex]  in a saturated solution is [tex]3.0\times 10^{-3}M[/tex]

Explanation:

Solubility product is defined as the equilibrium constant in which a solid ionic compound is dissolved to produce its ions in solution. It is represented as [tex]K_{sp}[/tex]

The equation for the ionization of [tex]CaSO_4[/tex]  is given as:

[tex]K_{sp}[/tex] of [tex]CaSO_4[/tex]  = [tex]9.0\times 10^{-6}[/tex]

By stoichiometry of the reaction:

1 mole of  [tex]CaSO_4[/tex] gives 1 mole of [tex]Ca^{2+}[/tex] and 1 mole of [tex]SO_4^{2-}[/tex]

When the solubility of [tex]CaSO_4[/tex] is S moles/liter, then the solubility of [tex]Ca^{2+}[/tex] will be S moles\liter and solubility of [tex]SO_4^{2-}[/tex] will be S moles/liter.

[tex]K_{sp}=[Ca^{2+}][SO_4^{2-}][/tex]

[tex]9.0\times 10^{-6}=[s][s][/tex]

[tex]9.0\times 10^{-6}=s^2[/tex]

[tex]s=3.0\times 10^{-3}M[/tex]

Thus concentration of [tex]CaSO_4[/tex]  in a saturated solution is [tex]3.0\times 10^{-3}M[/tex]

The number of radioactive atoms present in the sample is 1.01 × 10⁷ atoms.

Emission of Beta Particles takes place when there is a numerous amount of neutron to the proton in the nucleus. As a result, the neutron is transformed to proton (which is retained in the nucleus) and electron which leaves the nucleus under high energy.

Given that:

[tex]\mathbf{^{130} I \ \ \ \to ^{- \beta } \ \ \ ^{130}Xe }[/tex]

The rate of disintegration of the radioactive sample per minute is expressed by using the formula:

A = kN

where;

∴

[tex]\mathbf{N = \dfrac{A}{k}}[/tex]

[tex]\mathbf{N = \dfrac{9487}{0.00094}}[/tex]

N = 10092553.19 atoms

N = 1.01 × 10⁷ atoms  

Therefore, we can conclude that the number of radioactive atoms present in the sample is 1.01 × 10⁷ atoms.

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Answer:

because it covers a large area as there are more then 1 lakh compounds of organic chemistry.

Answer:

The gravitational force is inversely proportional to the square of the distance..

The electrical force is inversely proportional to the square of the distance..

Explanation:

From the Newton's law of universal gravity, we understood that the force of attraction between the masses two objects is inversely proportional to the square of the distance apart. Mathematically, it is expressed as:

F = GM1M2/r²

Where:

M1 and M2 are the masses of two objects measured in kilograms (Kg).

G is the gravitational constant with a value of 6.67×10¯¹¹ Nm²/Kg²

r is the distance apart measured in metre (m).

F is the force of attraction measured in Newton (N).

From the equation:

F = GM1M2/r²

The force (F) is inversely proportional to the square of the distance (r) apart. This means that the greater the distance apart, the smaller the force of attraction and the smaller the distance apart, the greater the force of attraction between the masses of the object.

From Coulomb's Law, we understood that the force of attraction between two charged particles is inversely proportional to square of the distance. Mathematically, it expreessed as

F = Kq1q2/ r²

Where:

q1 and q2 are charges of two objects measured in coulomb (C) .

r is the distance apart measured in metre (m)

K is the electrostatic constant with a value of 9×10^9 Nm²/C²

F is the force measured in Newton (N).

From the equation:

F = Kq1q2/ r²

The force (F) is inversely proportional to the square of the distance (r) apart.. This implies that as the distance between the charged particles increase, the smaller the force of attraction between them and as the distance between the charged particles decrease, the greater the force of attraction between the two charged particles.

Answer:

3 and 6

Explanation:

Answer:

[tex]Pb(ClO_{3})_{4}\\Pb(MnO_{4})_{4}\\Fe(ClO_{3})_{3}\\\Fe(MnO_{4})_{3}\\[/tex]

Explanation:

[tex]Pb^{4+}(ClO_{3}^{-})_{4}--->Pb(ClO_{3})_{4}\\Pb^{4+}(MnO_{4}^{-})_{4}--->Pb(MnO_{4})_{4}\\Fe^{3+}(ClO_{3}^{-})_{3}--->Fe(ClO_{3})_{3}\\\Fe^{3+}(MnO_{4}^{-})_{3}--->Fe(MnO_{4})_{3}\\[/tex]

Answer:

HCI(aq)+CH3COONa(s) ----> CH3COOH(aq)+NaCl(s)

NaOH(aq)+CH3COOH(aq) ----> CH3COONa(s)+H2O(l)

Explanation:

A buffer is a solution that resists changes in acidity or alkalinity. A buffer is able to neutralize a little amount of acid or base thereby maintaining the pH of the system at a steady value.

A buffer may be an aqueous solution of a weak acid and its conjugate base or a weak base and its conjugate acid.

The equations for the neutralizations that occurred upon addition of HCl or NaOH are;

HCI(aq)+CH3COONa(s) ----> CH3COOH(aq)+NaCl(s)

NaOH(aq)+CH3COOH(aq) ----> CH3COONa(s)+H2O(l)